Commit ee5d2acd authored Apr 06, 2010 by Eric Dumazet Committed by Linus Torvalds Apr 07, 2010

/dev/mem: allow rewinding



commit dcefafb6 ("/dev/mem: dont allow seek to last page") inadvertently
disabled rewinding on /dev/mem.

This broke x86info for example.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b1dd3b28

drivers/char/mem.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -710,11 +710,6 @@ static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
		switch (orig) {
		case SEEK_CUR:
		offset += file->f_pos;
		if ((unsigned long long)offset <
		(unsigned long long)file->f_pos) {
		ret = -EOVERFLOW;
		break;
		}
		case SEEK_SET:
		/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
		if ((unsigned long long)offset >= ~0xFFFULL) {